Abstract
In the period November 1, 1985 to January 31, 1986, 703 cases of giardiasis were reported in Pittsfield, Massachusetts (population 50,265). The community obtained its water from two main reservoirs (A and B) and an auxiliary reservoir (C). Potable water was chlorinated but not filtered. The incidence of illness peaked approximately two weeks after the city began obtaining a major portion of its water from reservoir C, which had not been used for three years. The attack rate of giardiasis for residents of areas supplied by reservoir C was 14.3/1000, compared with 7.0/1000 in areas that received no water from reservoir C. A case-control study showed that persons with giardiasis were more likely to be older and to have drunk more municipal water than household controls. A community telephone survey indicated that over 3,800 people could have had diarrhea that might have been caused by Giardia, and 95 per cent of households were either using alternate sources of drinking water or boiling municipal water. Environmental studies identified Giardia cysts in the water of reservoir C. Cysts were also detected in the two other reservoirs supplying the city, but at lower concentrations. This investigation highlights the risk of giardiasis associated with unfiltered surface water systems.
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Selected References
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- Belosevic M., Faubert G. M., MacLean J. D., Law C., Croll N. A. Giardia lamblia infections in Mongolian gerbils: an animal model. J Infect Dis. 1983 Feb;147(2):222–226. doi: 10.1093/infdis/147.2.222. [DOI] [PubMed] [Google Scholar]
- Craun G. F. Waterborne giardiasis in the United States 1965-84. Lancet. 1986 Aug 30;2(8505):513–514. doi: 10.1016/s0140-6736(86)90382-x. [DOI] [PubMed] [Google Scholar]
- Dykes A. C., Juranek D. D., Lorenz R. A., Sinclair S., Jakubowski W., Davies R. Municipal waterborne giardiasis: an epidemilogic investigation. Beavers implicated as a possible reservoir. Ann Intern Med. 1980 Feb;92(2 Pt 1):165–170. doi: 10.7326/0003-4819-92-2-165. [DOI] [PubMed] [Google Scholar]
- Jarroll E. L., Bingham A. K., Meyer E. A. Effect of chlorine on Giardia lamblia cyst viability. Appl Environ Microbiol. 1981 Feb;41(2):483–487. doi: 10.1128/aem.41.2.483-487.1981. [DOI] [PMC free article] [PubMed] [Google Scholar]
- López C. E., Dykes A. C., Juranek D. D., Sinclair S. P., Conn J. M., Christie R. W., Lippy E. C., Schultz M. G., Mires M. H. Waterborne giardiasis: a communitywide outbreak of disease and a high rate of asymptomatic infection. Am J Epidemiol. 1980 Oct;112(4):495–507. doi: 10.1093/oxfordjournals.aje.a113019. [DOI] [PubMed] [Google Scholar]
- Navin T. R., Juranek D. D., Ford M., Minedew D. J., Lippy E. C., Pollard R. A. Case-control study of waterborne giardiasis in Reno, Nevada. Am J Epidemiol. 1985 Aug;122(2):269–275. doi: 10.1093/oxfordjournals.aje.a114098. [DOI] [PubMed] [Google Scholar]
- Sauch J. F. Use of immunofluorescence and phase-contrast microscopy for detection and identification of Giardia cysts in water samples. Appl Environ Microbiol. 1985 Dec;50(6):1434–1438. doi: 10.1128/aem.50.6.1434-1438.1985. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Shaw P. K., Brodsky R. E., Lyman D. O., Wood B. T., Hibler C. P., Healy G. R., Macleod K. I., Stahl W., Schultz M. G. A communitywide outbreak of giardiasis with evidence of transmission by a municipal water supply. Ann Intern Med. 1977 Oct;87(4):426–432. doi: 10.7326/0003-4819-87-4-426. [DOI] [PubMed] [Google Scholar]
- Young K. H., Bullock S. L., Melvin D. M., Spruill C. L. Ethyl acetate as a substitute for diethyl ether in the formalin-ether sedimentation technique. J Clin Microbiol. 1979 Dec;10(6):852–853. doi: 10.1128/jcm.10.6.852-853.1979. [DOI] [PMC free article] [PubMed] [Google Scholar]